I have V2 and regarding USB in, it runs with no issues at all. Warning, I dont know the measurements and the techhcalites,,,,besides the headphone out, I have been using XLRs as well as RCAs connected to my amp since august, and also there, there are no problems. I am verifying the SQ against the very highly regarded E1DA 9038S Gen 3 Susumu, my old OPPO HA-SE2, a Maratz with AKM AK4458 192 kHz/32 Bit, and to my ears the M500 sounds the best, with no distortions and no heat problems. I listen to Tidan hifi, often to MASTER MQA tracks. I love the M500. It is small, easy to place, cute, has a remote, is versatile, but with one problem, it has no balanced out for HPs. -- 4.4 pentacons out should be standard for DAC/AMP of this class and above. Prior buying M500, I Also considered Topping DX7 Pro (impedance of 6.2), but to me M500 on paper and by measurements appeared to be better.